- Symbiosis Commission oversaw the joining of the Trills & symbionts;
- Law forbade reassociation between hosts that had been romantically involved;
- Zhian'tara: a ritual for a joined Trill meets the previous hosts of the Symbiont
Highlights:
- Only a certain number of Trill could be joined
- Joining dates back to the 12th century, not widely known before 2367
- The Burn resulted in the depletion of the symbiont & joinable-host population